Update slack-provisioning-tutorial.md

[Nolyb]

Updated prerequisites to avoid confusion when this process fails for Slack Enterprise Grid customers. When following these instructions, Enterprise Grid customers would get the error non_org_teams_only when attempting to set up provisioning via the App Gallery.

[prmerger-automator]

@Nolyb : Thanks for your contribution! The author(s) have been notified to review your proposed change. @thomasakelo

[learn-build-service-prod]

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[ttorble]

@owinoakelo

Can you review the proposed changes? Note that the author metadata for the article should reflect your GitHub alias. Can you create a PR in the private repo to update it? Thanks.

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[owinoakelo]

@ZollnerdMSFT can you review this

[github-actions]

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[v-dirichards]

@owinoakelo - Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!

[omondiatieno]

@v-dirichards, @owinoakelo no longer owns this content. I've reached out to current PM owner to look at it. Thanks.

[v-dirichards]

@v-dirichards, @owinoakelo no longer owns this content. I've reached out to current PM owner to look at it. Thanks.

@omondiatieno Thank you for doing that, we appreciate it!